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/*
* Oreka -- A media capture and retrieval platform
*
* Copyright (C) 2005, orecx LLC
*
* http://www.orecx.com
*
* This program is free software, distributed under the terms of
* the GNU General Public License.
* Please refer to http://www.gnu.org/copyleft/gpl.html
*
*/
#include "MediaChunkFile.h"
#define MAX_CHUNK_SIZE 100000
MediaChunkFile::MediaChunkFile()
{
m_stream = NULL;
m_mode = READ;
m_numChunksWritten = 0;
m_sampleRate = 0;
}
MediaChunkFile::~MediaChunkFile()
{
Close();
}
void MediaChunkFile::Close()
{
if(m_stream)
{
ACE_OS::fclose(m_stream);
m_stream = NULL;
}
}
void MediaChunkFile::WriteChunk(AudioChunkRef chunkRef)
{
if(chunkRef.get() == NULL)
{
return;
}
if(chunkRef->GetDetails()->m_numBytes == 0)
{
return;
}
unsigned int numWritten = 0;
bool writeError = false;
if (m_stream)
{
int tmp = sizeof(AudioChunkDetails);
numWritten = ACE_OS::fwrite(chunkRef->GetDetails(), sizeof(AudioChunkDetails), 1, m_stream);
if(numWritten != 1)
{
writeError = true;
}
numWritten = ACE_OS::fwrite(chunkRef->m_pBuffer, sizeof(char), chunkRef->GetNumBytes(), m_stream);
if(numWritten != chunkRef->GetNumBytes())
{
writeError = true;
}
}
else
{
throw(CStdString("Write attempt on unopened file:")+ m_filename);
}
if (writeError)
{
throw(CStdString("Could not write to file:")+ m_filename);
}
}
int MediaChunkFile::ReadChunkMono(AudioChunkRef& chunkRef)
{
unsigned int numRead = 0;
bool readError = false;
if (m_stream)
{
chunkRef.reset(new AudioChunk());
short temp[MAX_CHUNK_SIZE];
numRead = ACE_OS::fread(temp, sizeof(AudioChunkDetails), 1, m_stream);
if(numRead == 1)
{
AudioChunkDetails details;
memcpy(&details, temp, sizeof(AudioChunkDetails));
if(details.m_marker != MEDIA_CHUNK_MARKER)
{
throw(CStdString("Invalid marker in file:")+ m_filename);
}
if(details.m_numBytes >= MAX_CHUNK_SIZE)
{
throw(CStdString("Chunk too big in file:")+ m_filename);
}
else
{
numRead = ACE_OS::fread(temp, sizeof(char), details.m_numBytes, m_stream);
if(numRead != details.m_numBytes)
{
throw(CStdString("Incomplete chunk in file:")+ m_filename);
}
chunkRef->SetBuffer(temp, details.m_numBytes, details);
}
}
}
else
{
throw(CStdString("Read attempt on unopened file:")+ m_filename);
}
return numRead;
}
void MediaChunkFile::Open(CStdString& filename, fileOpenModeEnum mode, bool stereo, int sampleRate)
{
if(m_sampleRate == 0)
{
m_sampleRate = sampleRate;
}
if(!m_filename.Equals(filename))
{
m_filename = filename + GetExtension();
}
m_stream = NULL;
m_mode = mode;
if (mode == READ)
{
m_stream = ACE_OS::fopen((PCSTR)m_filename, "rb");
}
else
{
RecursiveMkdir(m_filename);
m_stream = ACE_OS::fopen((PCSTR)m_filename, "wb");
}
if(!m_stream)
{
throw(CStdString("Could not open file: ") + m_filename);
}
}
CStdString MediaChunkFile::GetExtension()
{
return ".mcf";
}
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